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Tuesday, February 14, 2017

Galle

Galle is a crater on Mars located on the eastern rim of the huge impact basin Argyre Planitia in the Argyre quadrangle. It is named after astronomer Johann Gottfried Galle. Galle is often known as the "happy face crater" because the illusion of a smiley is created by a curved mountain range in the southern part of the crater and two smaller mountain clusters further north. The formation was first photographed by Viking Orbiter 1.

A second "happy face crater", smaller than Galle and located at 45.1°S, 55.0°W in Nereidum Montes, was discovered by the Mars Reconnaissance Orbiter on January 28, 2008.